Kansas City Royals right fielder Jac Caglianone settles in a second base after hitting a double for his first hit in Major League Baseball on Thursday, June 5, 2025 against the Cardinals at Busch Stadium in St. Louis. Jeff Curry Imagn Images

The Jac Caglianone era is underway for the Royals. Tuesday evening, Kansas City's No. 1 prospect made his big-league debut against the St. Louis Cardinals at Busch Stadium after only 79 minor-league games.

Royals fans who attended spring training got a close look at Jac Caglianone. The 6-foot-5, 250 pound athlete put on a show during batting practice. He hit several homers toward the Arizona skyline at the club’s facility. He also made quite the impression in Cactus League play. One highlight that stood out was against the Milwaukee Brewers.